Get Last week date range from sunday to saturday moment js

Thinking Simply: Set the Week Starting Day first

moment.updateLocale('en', {
    week : {
        dow :0  // 0 to 6 sunday to saturday
    }
});

//than get current week or get last week according to Sun -- Sat
'This Week': [moment().startOf('week'), moment().endOf('week')],
'Last Week': [moment().startOf('week').subtract(7,'days'), moment().endOf('week').subtract(7, 'days')],

you can simply use it with data-ranger in my case i am using "daterangepicker" hopefull you will understand

isoWeek gets you the start of week as per ISO 8601 standard. According to international standard ISO 8601, Monday is the first day of the week.

You may try using week instead of isoWeek in the method, which works as per your system settings (locale).

console.log(moment().subtract(1, 'weeks').startOf('isoWeek').format('dddd'));
console.log(moment().subtract(1, 'weeks').endOf('isoWeek').format('dddd'));

console.log(moment().subtract(1, 'weeks').startOf('week').format('dddd'));
console.log(moment().subtract(1, 'weeks').endOf('week').format('dddd'));

console.log(moment().subtract(1, 'weeks').startOf('week').format('YYYY-MM-DD'));
console.log(moment().subtract(1, 'weeks').endOf('week').format('YYYY-MM-DD'));

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Read the difference here.